Only use master shards for commits / files.
Only use master shards for commits / files.

This is because Write Commits won't be replicated and it leads to errors
not seeing them.

ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,alexdebrie/pachyderm,alexdebrie/pachyderm,sambooo/pachyderm,sambooo/pachyderm,klucar/pachyderm,klucar/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,klucar/pachyderm